论文标题
动力学驱动的ekpyrosis
Kinetically-driven ekpyrosis
论文作者
论文摘要
我们探讨了通过非规范动能密度而不是负电位来驱动埃克抗膜片收缩的标量场的可能性。我们发现，在各种模型中，可以在各种模型中实现这种动力学驱动的ekpyprosis（“ K-Ekpyrosis”），包括具有幂律，多项式或DBI样动力学术语的标量场理论。在这些示例中，ekpyrotic阶段在幂律模型中最好地持续，该模型可以产生大型且恒定的状态参数，然后是类似DBI的模型，该模型可以表现出针对类似大型状态方程的动态吸引子。我们表明，对于包括这些示例在内的广泛理论，K-卵回旋症的阶段伴随着超浮肿性的先前或并发阶段。
We explore the possibility of a scalar field driving ekpyrotic contraction through a non-canonical kinetic energy density rather than a negative potential. We find that this kinetically-driven ekpyrosis ("k-ekpyrosis") can be achieved in a variety of models, including scalar field theories with power-law, polynomial, or DBI-like kinetic terms in the action. Of these examples, the ekpyrotic phase is best sustained in power-law models, which can generate large and constant equation-of-state parameters, followed by DBI-like models, which can exhibit dynamical attractors toward similarly large equations of state. We show that for a broad class of theories including these examples, phases of k-ekpyrosis are accompanied by preceding or concurrent phases of superluminality.
